Add the modules to:
/etc/modprobe.d/blacklist.conf
And re-install the kernel. The dracut util that builds the initramfs includes this file at install time.
at last, I've had the opportunity to pursue this. all I have to do is blacklist the snd_hda_codec_realtek module, reboot and voila, it boots right up. Of course, there's no sound,... Seems odd that I don't need to rebuild the initramfs (dracut), but I don't seem to need to do that.
Then the sound module doesn't get loaded until after the initramfs does the switchroot, which would mean the blacklist is read from your filesystem, and not from the copy that exists inside the initramfs itself. Either way, glad it worked out.
Is this enough info, along with the core dump photos, to make a worthwhile bugzilla report? if not, I'm open to ideas on how to further track it.
Should be, yes.